(Linux Command Line) Part 4 – Commands Line for Network Configurationin Linux (CentOS, Ubuntu)

Linux is an open supply Operating System, basically used on servers and mainframes because of its prime balance, secured and unfastened. This is a component 4 of the serial Linux Command Line – Commands Line for Network Configuration in Linux (CentOS, Ubuntu)

Serial Linux Commands:

1) Commands Line for Network Configuration in Linux (CentOS, Ubuntu)

Ubuntu, CentOS, and different Linux working methods believe a community card as a tool. They save the configuration within the textual content record, then load it each time the device boots up. Each laptop wishes a stressed out or wi-fi Ethernet card, indexed within the /dev listing with a reputation starting with 3 letters Eth, as an example, eth0 for the primary community card, eth1 for the second one community card…
The Network configuration recordsdata of CentOS and Ubuntu are most often other. For instance, in Ubuntu, the community configuration record is saved in /and so forth/community/interface/ whilst in CentOS, it’s saved in /and so forth/sysconfig/network- Scripts/

1.1. Commands for Checking community data in CentOS and Ubuntu

COMMAND	PURPOSE / DESCRIPTION
ifconfig -a | grep eth	Check the overall choice of community playing cards within the device
ifconfig	Check the configuration (MAC, IP cope with, gateway ..) of all of the community card within the gadget (very similar to the IPCONFIG command in Windows)
ifconfig card-name	Check the configuration of the community card named card-name (eg: ifconfìg eth0)
course -n	Check the course of packets (very similar to the ROUTE command in Windows)

1.2. Commands for Network Configuration in CentOS and Ubuntu

COMMAND	PURPOSE / DESCRIPTION
sudo ifconfig eth0 up	Enable the community card eth0 in Ubuntu
sudo ifconfig eth0 down	Disable the community card eth0 in Ubuntu
ifconfig card IP1 netmask IP2	Set the community configuration for a community card. For instance, to set the IP for eth0 to 192.168.1.100, netmask= 255.255.255.zero with this command: ifconfig eth0 192.168.1.2 netmask 255.255.255.zero Warning: This configuration can be reset/ deleted after the device re-start
vi /and so forth/community/interfaces	Set up the community configuration record in Ubuntu with VI Text Editor
vi  /and so forth/sysconfig/network-scripts/ifcfg-eth0	Set up the configuration for community card Ethzero in CentOS with VI Text Editor
/and so forth/init.d/networking restart	Restart the community card in Ubuntu (to use adjustments)
provider community restart	Restart the community card in CentOS (to use adjustments)
vi /and so forth/resolv	Set call servers for CentOS and Ubuntu. For instance: nameserver 8.8.8.8 nameserver 8.8.4.4
course upload default gw 192.168.1.1	Set 192.168.1.1 because the default gateway in Ubuntu. In distinction to the command Add, we use the command Delete (as an example: course delete default gw 192.168.1.1)
course upload -net 192.168.5.zero masks 255.255.255.zero dev eth0	Add a static routing to the community (for the community card Ethzero). In distinction to the command Add, we use the command Delete

1.3. Other Command Line for Networking in CentOS and Ubuntu

COMMAND	PURPOSE / DESCRIPTION
netstat	Display community connections (similar in Windows)
traceroute serverA	Trace packet routing to serverA
nslookup	Query the area server (call server)
rlogin serverA	Connect to a faraway device
telnet serverA	Connect to a faraway device (higher interacting than rlogin)
rcp fileX serverA	Copy a record (fileX) from the faraway server (serverA)
ftp	Transfer recordsdata between methods on a community
rsh commandA	Run a command on a faraway device with out logging in
ping serverA	Check connection to a faraway device (similar in Windows)
liquid crystal display trail	Change native folder when logged in on faraway gadget
mesg y/n	Set choices for different customers to put in writing messages for you
write consumer	Send a message to some other consumer
communicate consumer	Allow 2 other people to speak with every different

Now I will be able to information intimately the best way to use the above instructions to configure the community for CentOS and Ubuntu

2) Guide the best way to Configure the community in CentOS and Ubuntu

2.1. Configure community in Ubuntu

Step 1: Open the configuration record with VI textual content editor

sudo vi /and so forth/community/interfaces

Your display screen will show the community configuration like this:

auto lo
iface lo inet loopback
auto eth0
iface eth0 inet static
cope with 192.168.1.2
netmask 255.255.255.1.zero
gateway 192.168.1.1

=> You can exchange the “red text” above along with your IP

If you need to make use of a dynamic IP from the DHCP server, we claim the next instructions within the record /and so forth/community/interfaces:

auto lo
iface lo inet loopback
auto eth0
iface eth0 inet dhcp

Step 2: Reboot or Restart the Networking provider through the use of the next command:

/and so forth/init.d/networking restart

Step 3: In maximum circumstances, your community instrument will paintings neatly after step 2. But in some case, it’s a must to config the Nameserver. Here’s how:

sudo vi /and so forth/resolv.conf

Enter the contents of the record as beneath then Save it

nameserver 8.8.8.8
nameserver 8.8.8.4

Done !!

2.2. Configure community in CentOS

Step 1: Use the command ifconfig to test your community playing cards

Step 2: Specify which community card to config (as an example: Ethzero), then open the configuration record with VI textual content editor

vi  /and so forth/sysconfig/network-scripts/ifcfg-eth0

Your display screen will show the community configuration like this:

DEVICE=eth0
TYPE=Ethernet
ONBOOT=sure
BOOTPROTO=none
BROADCAST=192.168.1.255
HWADDR=00:25:90:C3:65:BC
IPADDR=192.168.1.100
NETMASK=255.255.255.zero
GATEWAY=192.168.1.1
DNS1=8.8.8.8

=> You can exchange the “red text” above along with your IP
If you need to make use of a dynamic IP from the DHCP server, we wish to exchange the record contents to:

DEVICE=eth0
TYPE=Ethernet
ONBOOT=sure
NM_CONTROLLED=sure
BOOTPROTO=DHCP
DNS1=8.8.8.8

Step 2: Reboot or Restart the Networking provider through the use of the next command:

/and so forth/init.d/networking restart

All finished !!
Feel unfastened to go away a remark if you wish to have any lend a hand.

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